Cael wittensteom



(No Model.) V Y G. WITTENSTROM.

METAL MOLD' FOR CASTING.

10.317,064. `PaA-.ented My 5,1885.

N. FEYERa Phntvulnegmpher. waning, D. c.

UNITED STATES PATENT OEEIcE.

CARL WITTENSTRM, OF STOCKHOLM, SWEDEN.

METAL MOLD FOR CASTINGS.

SPECIFICATION forming part of Letters Patent No. 317,064, dated May 5. 1885.

Application filed April 15, 1884. (No model.)

To all whom it may concern:

Be it known that I, CARL WrTTENsTni/I, engineer, a subject ofthe King of Sweden, residing in Stockholm, in the Kingdom of Sweden,

5 have invented a new and useful Improvement kin Metal Molds for Castings, oi' which the following is a specification.

When castings are to bemade in molds of metal, the molds should be so constructed as to allow the castings to be easily and speedily taken out of them, andprovision should be made for heating or cooling the molds, when required, so as to permit casting in the same mold to be repeated in quick succession; and to this end my invention consists in providing the molds with double wallslandhellow hinge- `bolts, so that steam or hot air may be admitted through said hollow hinge-bolts into the space between said walls to heat the mold pre,-

2o paratory to casting, and cold water afterward while thecasting is going on, tokeep the mold ,Y

` the mold may be easily opened after casting. 5

cool.'

In the drawings, Figurel represents a mold embodying my invention in elevation, the up- 25 per hinge in section. Fig. 2 is a plan. Fig. 3 shows a longitudinal section, and Fig. '4 a cross-section above the lock. show the arrangement common to all such molds, but the shape and size vary according 3o to the shape and size of the castings.

These molds consist of two halves, S T, of cast-iron or soft steel, united with the hinges u u', and one or more locks, c. w is the open space in which the metal is poured, and w' the 35 gate. To form the double walls, each moldhalf is cast with flanges round about, to which 'the plates y'yare bolted. There are also some transverse ribs,z z', to make the water or steam circulate. These ribs serve also to strengthen 4o the mold. The water is led to the mold and away from it through the hollow bolts a2 of the hinge-joints a', which bolts communicate These figures The more delicate parts in the molds, which parts may be worn out, are separately made and fixed to the mold for being replaced, as shown at m" in Figs. 3 and l.

By means of lugs on the half of the mold without l0cks,tl1e mold may be attached either to a casting-wagon, as are the smaller molds, or to some other suitable support during the casting process; but `that half of the meld which carries the lock ought to be free, so that What I claim is- 1. vThe two-part mold having double walls and hinged together by hollow hinge-bolts,`

and passages communicating with said hollow hinge-bolts leading to the space between the double walls of the molds, whereby steam or cold water may be admitted to heat or cool the mold, substantially as specified.

2. The combination of the mold-parts S T, provided with double walls, with hinges u uniting said parts, and hollow hinge-bolts a? communicating with passages leading into the space between said double walls, and steam and cold-water pipes connected to said hollohwr hinge-bolts and provided with suitable valves. substantially as speciied.

CARL `I'VITTENSTROM. Vitnesses:

ALBERT NILssoN, J. F. BAOKLUND. 

